Marian A. Czarnecki, 83, who was chief of staff of the House Foreign Affairs Committee for four years before joining Inter-American Development Bank, died Feb. 23 at Cameron Glen rehabilitation center in Reston. He had complications from sepsis. Mr. Czarnecki began working on Capitol Hill in 1948 as a congressional aide to the Foreign Affairs Committee. In 1960, he began working for the committee full time, becoming chief of staff in 1972.In 1976, Mr. Czarnecki joined the Washington-based Inter-American Development Bank as a senior adviser to the president. The bank offers developmental financing to Latin American and Caribbean countries. He retired in 1987.Marian Anthony Bruno Czarnecki was born in Poznan, Poland. Following the 1939 German invasion of Poland, Mr. Czarnecki and his family fled to the United States and settled in Milwaukee. He served in the U.S. Army during World War II. After retiring, Mr. Czarnecki owned a vineyard and tree farm near Leesburg, from which he sold Christmas trees. He became active in Leesburg environmental preservation efforts and served on the Loudoun County Rural Economic Development Council and volunteered with the Loudoun Soil and Water Conservation District. Joan Humphreys Czarnecki, his wife of 56 years, died in 2005.Survivors include three children, John Czarnecki of Portland, Ore.; Andrew Czarnecki of Leesburg; and Julie Scott of Wakefield, Mass.; six grandchildren; and one great-granddaughter.